Improvement in gas-stoves



C. HOFFMANN. Gas-Stove.

Patented Oct. 21, 1879 EL g5...

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CHARLES HOFFMANN, OF NEW YORK, N. Y.

IM PROVEM ENT IN GAS-STOVES.

Specification forming part of Letters Patent No. 220,838, dated October21, 1879; application filed September 4, 1879.

To all 'whom fit may concern Be it known that I, CHARLES HOFFMANN, ofthe city, county, and State of New York,

'have invented a new and useful Improvement 1. Fig. 4 is a like sectionin the plane y y.

Fig. 5 is a like section in the plane z a.

Similar letters indicate corresponding parts. My invention relatesespecially to gas-stoves for heating purposes; and it consists in thecombination of a combustion-chamber, a central air-heating flue, agas-burner, consist-ing of two or more jackets surrounding theairheating tlue in the lower part of the combustion-chamber, andgas-supply pipes, one to each ot' the jackets, so that the heat of thegastlame ascends in the combustion-chamber and acts upon the air-heatingflue, while the dame can be enlarged or reduced by supplying gas to oneor both jackets of the burner. In the airrheating lue, immediately abovethe gasburner, is a gallery, and in this gallery is a division forretarding the circulation ot' air,

thereby increasing the effect ot' the gas-flame.

Into the upper part of the combustion-chamber is fitted a water-jacket,and above this jacket is a cap, which slid son the air-heating flue, andis adapted to be set, by appropriate mechanism, while a smoke-pipeprojects from the coinbustionchamber below the top of the water-jacket,so that `the products of combustion may be permitted to escape either atthe top of the combustion-chamber or through the smoke-pipe. Air issupplied to the air-heatin g flue through an airAreceiver, which has twoholes, one for admitting inside or apartment air, and the other foradmitting outside air from an air-supply pipe, and a register is used toopen and close either ofthe holes. By combinin g the water-jacket andconcomitante with the peculiar air-receiver, fresh air may be sup.- wplied to an apartment, while the inside or apartment air may be carriedoft with the products of combustion, whereby the apartment is ventilatedin an effective manner.

In the drawings, the letter A designates the combustion-chamber; B, thecentral air-heating tlue, and C the gas-burner. This burner is situatedin the lower part of the combustion-ohamber A, and is constructed of twojackets, a b, surrounding the air-heating ilue B, both jackets beingclosed at the bottom and open at the top, and an air-space being leftbetween them, as well as between the inner jacket and the iiue, asshown.-

The letter c designates the gas-supply pipes. These pipes are,respectively, connected to the jackets a b, and extend through the sideof the combustion-chamber A, each pipe being provided with a stop-cock,d, and being connected to a feed-pipe, e. By this arrangement gas canreadily be supplied to either or both jackets ofthe burner C, whence itascends in the combustion-chamber, therebyheating the central tlue. Airis admitted to the lower part ofthe combustion-chamber, to support thedame of the burner C, through holes f.

The letterD designates the gallery in the air-heating ue B, and g is adivision in this gallery. The position ot' the gallery D is inimediatelyabove the gas-burner G, and the division g, in this example, runs in aspiral direction. By this gallery D and its division, the effect of thegas-dame upon the air circulating in the air-heating-lue B is manifestlyincreased, the gallery being, subjected to the direct action of theflame, while the flow of air is retarded at that point.

The letter E designates the water-jacket l fitted into the upper part ofthe combustionchamber; F, the cap sliding on the air-heating due B,above such jacket, and H the smokepipe projecting from thecombustion-chamber A below the top of the jacket. The jacket E is soconstructed that a space, l, is left between it and the air-heating iiueB, and it is provided with two faucets, L- z', one ot' which connectswith a vertical pipe, j, perforated near the top.

Water or other liquid may be forced into the jacket E through either orboth of the faucets 71l i, and the pipe j serves to determine thelevelof the liquid therein.

rEhe cap F is titted on the air-heating flue B, and, in this example, israised and lowered by means of a forked lever, J, which has its fulcrumat k, and is connected to the cap by means of rods I. In the smoke-pipell is a damper.

If the cap 1-` is raised, as shown, the products of combustion ascendingin the combustion-chamber A pass up through the space I, and under thecap, whence they escape at the top of the chamber, the latter heiligperforated for this purpose, as at n; lult it' the cap is lowered asufficient distance to dip into the Water in the jacket E, such productsare thereby checked, and caused to pass cti' through the smoke-pipe H.

The letter L designates thc air-receiver supplying air to theheating-tine B. This receiver constitutes a support for the wall ot' thecombustion-chamber A, and the a-irhcating ue B rises therefrom, asshown.

In the bottom of the air-receiver L are two holes, o o', one of whichconnects with a pipe, N, intended to communicate with thc outer air, andupon this bottom is a register, 0, consisting of a plate which has holesp p', corresponding to the holes in the bottom, and which is secured toa pivot, q, having a handle, P, for turning the same. The function ofthis register 0 is to open and close either hole, o or o', of theair-receiver.

By opening the hole o air is admitted to the receiver L, and thence tothe heating-pipe B, from the apartment in which the stove is located,while by opening the hole o', outside or fresh air is admitted.

1f the freslrairsupply hole o is opened, and the cap F is lowered toclose the top of the combustion-chamber A, a simultaneous supply anddischarge ot' air to and from the apartment take place, the fresh airflowing in through the heating-tine B, while the apartmeutair escapeswith the products ot` combus tion.

Itis obvious that in this manner the apartment is effectivelyventilated.

Heretofore a gasburning stove has been provided with a centralair-heating tine, communicating at its lower and upper ends with theexternal atmosphere, and having a gashurner arranged within thecombustion-chamber, and such, broadly, I hereby disclaim.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a gas-burning stove, the combination of an air-receiving chamber,an air-supply pipe leading from the same through the casing to theexternal atmosphere, a register, as described, for controlling theadmission of air through said pipe, a combustion-chamber arranged above,and separated from the air-re ceiving chamber, a vertical air-heatingHue, having its lower end opening into said re ceiver, a gallery in theair-heating ue provided with a tortuous passage, and a gasburner`arranged within the combustionchamber, and directly beneath the gallery,the whole being constructed and arranged substantially as shown, for thepurpose described.

2. In a gas-stove, the combination, with a combustion-chamber and acentral air-heating ilue, of a Water-jacket fitted into the upper partof the combustion-chamber, a cap sliding on the air-heating fine abovethe water-jacket, mechanism for setting the cap, and a smoke-pipeprojecting from the combustionchamber, below the top of thewater-jacket, all constructed and adapted to operate substantially asdescribed.

3. The combination of the air-receiver L and its two holes, the registerO, air-heating flue B, combustion-chamber A, water-jacket E, cap F, andsmoke-pipe H, all constructed and adapted to operate substantially asdescribed.

In testimony that l claim the foregoing I have hereunto set my hand andseal this 29th day of August, 1879.

CHAS. HOFFMANN.

Witnesses W. HAIFF, E. F. KASTENHUBER.

